The real estate glut in China can be seen through its new ghost cities: Dongling, Nanguan, Kerqin, Saihan, Yijinhuoluoqi, Yuhong. They were discovered by a Peking University study which utilized Baidu data to discover cities with major housing developments that search engine's users were not visiting very often. The rationale was that if no one went to these places, then there was a possibility that they were vacant. These ghost towns were systematically built at the peak of China's urbanization boom.